Heat from Deep Underground

In the picture

1. 1Deep hot rock: rock far below the surface that stays hot the whole year
2. 2Pipe loop: water travels down, heats up, and returns to the surface
3. 3Turbine and generator: rising steam spins the turbine, which drives the generator
4. 4Radiator: hot water from underground warms a room

Examples

• A hot spring or geyser, where underground heat warms water that reaches the surface
• A town that heats its swimming pool with warm water pumped from deep wells

Quiz: Heat from Deep Underground (Age 14)

1. 1

   Why can heat from deep underground be captured almost anywhere?

   • Because sunlight warms underground rocks all year
   • Because Earth is hot deep inside
   • Because water pipes create the heat themselves
2. 2

   What happens to water in the pipe loop?

   • It travels down and returns without picking up heat
   • It is heated at the surface and sent down to cool the rocks
   • It travels down, heats up, and returns to the surface
3. 3

   How is underground heat used, depending on how hot the water or steam is?

   • Warm water heats buildings, while very hot steam makes electricity
   • Warm water makes electricity, while very hot steam heats buildings
   • Both warm water and very hot steam are used only to heat buildings

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.